Washington Non-Parent Custody — Agreed is a legal process in the state of Washington that allows an adult other than a child's parent to seek legal custody of the child. This process is also known as third-party custody and can be used when parents are unable or unwilling to provide appropriate care for their child. Washington Non-Parent Custody — Agreed is a voluntary agreement between the non-parent and the parents that outlines a shared custody arrangement and the rights and responsibilities of those involved. There are two types of Washington Non-Parent Custody — Agreed: temporary and permanent. Temporary non-parent custody is available for up to one year and can be extended with the agreement of all parties. Permanent non-parent custody is available when the parents consent to the non-parent having permanent legal and physical custody of the child.